Vista - Error message on sendind from windows live

i have a yahoo and a live email i am tryn my hardest to set them up on windows mail. my live i can receive on but on send but my yahoo will not either THese are THE ERROR MESSAGE

The message could not be sent. The authentication setting might not be correct for your outgoing e-mail [SMTP] server. For help solving this problem, go to Help, search for "Troubleshoot Windows Mail", and read the "I'm having problems sending e-mail" section. If you need help determining the proper server settings, please contact your e-mail service provider.

The rejected e-mail address was 'badassme82@live.com'. Subject 'fgh', Account: 'pop3.live.com', Server: 'smtp.live.com', Protocol: SMTP, Server Response: '550 5.7.3 Requested action aborted; user not authenticated', Port: 25, Secure(SSL): Yes, Server Error: 550, Error Number: 0x800CCC78


The host 'pop.att.yahoo.com' could not be found. Please verify that you have entered the server name correctly.
Account: 'pop.att.yahoo.com', Server: 'pop.att.yahoo.com', Protocol: POP3, Port: 995, Secure(SSL): Yes, Socket Error: 11001, Error Number: 0x800CCC0D

The host 'smtp.live.com' could not be found. Please verify that you have entered the server name correctly.
Subject '', Account: 'pop3.live.com', Server: 'smtp.live.com', Protocol: SMTP, Port: 25, Secure(SSL): Yes, Socket Error: 11001, Error Number: 0x800CCC0D

The host 'pop3.live.com' could not be found. Please verify that you have entered the server name correctly.
Account: 'pop3.live.com', Server: 'pop3.live.com', Protocol: POP3, Port: 995, Secure(SSL): Yes, Socket Error: 11001, Error Number: 0x800CCC0D

please help me please i have worked all day for two days and cant get it to work.






CAN SOMEONE PLEASE HELP ME. I NOT COMPUTER SMART.